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Back to skwsproul's post in response to Dowadudda - "how often do you guys run into a situation where one can not get the two different devices integrated?"
In this case, a programmable controller has to take care of the logic for commanding the hw VAVs to the desired mode. The Trane unit won't do it, so in this case most likely an XL50 or 500 would be in place at the middle to achieve the translation.

Yep that would be one way to integrate. Though a jace would be better as someone else already stated.

A way to think of that for those learning here about integrating 2 different types or brands of controllers.
Its kinda like a Mac talking to a PC via an internet connection, the browser (or the plugins attached to the browser ie Java) becomes the interpreter between the 2. Probably not the best analogy but it should help

Even those left is simply a formality because tell me who is integrating bacnet multi-vendor across ARCNET? However, I can understand why ALC wants to use it. It is deterministic. So, when you have Mr. unreliable MSTP by comparison I can see why you want the ARCNET... if you aren't using a a more modern and robust field bus.

I think maybe bacnet/IP is most common now. Do you really achieve 76.8 or is this simply a max setting?

History: My question was specific to the ALC lineup and why they use ARCNET. Xarulu wanted to suggest that LON had a single chip maker (Echelon) FALSE and wanted to suggest this was more proprietary than his ALC lineup, which is why I brought up ARCNET because even the bacnet guys complain about this... (see previous)

Anyway, I understand why ALC would want to use it over MSTP. It would be more reliable.